1 |
=head1 NAME |
2 |
|
3 |
AnyEvent::FCP - freenet client protocol 2.0 |
4 |
|
5 |
=head1 SYNOPSIS |
6 |
|
7 |
use AnyEvent::FCP; |
8 |
|
9 |
my $fcp = new AnyEvent::FCP; |
10 |
|
11 |
# transactions return condvars |
12 |
my $lp_cv = $fcp->list_peers; |
13 |
my $pr_cv = $fcp->list_persistent_requests; |
14 |
|
15 |
my $peers = $lp_cv->recv; |
16 |
my $reqs = $pr_cv->recv; |
17 |
|
18 |
=head1 DESCRIPTION |
19 |
|
20 |
This module implements the freenet client protocol version 2.0, as used by |
21 |
freenet 0.7. See L<Net::FCP> for the earlier freenet 0.5 version. |
22 |
|
23 |
See L<http://wiki.freenetproject.org/FreenetFCPSpec2Point0> for a |
24 |
description of what the messages do. |
25 |
|
26 |
The module uses L<AnyEvent> to find a suitable event module. |
27 |
|
28 |
Only very little is implemented, ask if you need more, and look at the |
29 |
example program later in this section. |
30 |
|
31 |
=head2 EXAMPLE |
32 |
|
33 |
This example fetches the download list and sets the priority of all files |
34 |
with "a" in their name to "emergency": |
35 |
|
36 |
use AnyEvent::FCP; |
37 |
|
38 |
my $fcp = new AnyEvent::FCP; |
39 |
|
40 |
$fcp->watch_global (1, 0); |
41 |
my $req = $fcp->list_persistent_requests; |
42 |
|
43 |
TODO |
44 |
for my $req (values %$req) { |
45 |
if ($req->{filename} =~ /a/) { |
46 |
$fcp->modify_persistent_request (1, $req->{identifier}, undef, 0); |
47 |
} |
48 |
} |
49 |
|
50 |
=head2 IMPORT TAGS |
51 |
|
52 |
Nothing much can be "imported" from this module right now. |
53 |
|
54 |
=head1 THE AnyEvent::FCP CLASS |
55 |
|
56 |
=over 4 |
57 |
|
58 |
=cut |
59 |
|
60 |
package AnyEvent::FCP; |
61 |
|
62 |
use common::sense; |
63 |
|
64 |
use Carp; |
65 |
|
66 |
our $VERSION = '0.3'; |
67 |
|
68 |
use Scalar::Util (); |
69 |
|
70 |
use AnyEvent; |
71 |
use AnyEvent::Handle; |
72 |
use AnyEvent::Util (); |
73 |
|
74 |
sub touc($) { |
75 |
local $_ = shift; |
76 |
1 while s/((?:^|_)(?:svk|chk|uri|fcp|ds|mime|dda)(?:_|$))/\U$1/; |
77 |
s/(?:^|_)(.)/\U$1/g; |
78 |
$_ |
79 |
} |
80 |
|
81 |
sub tolc($) { |
82 |
local $_ = shift; |
83 |
1 while s/(SVK|CHK|URI|FCP|DS|MIME|DDA)([^_])/$1\_$2/; |
84 |
1 while s/([^_])(SVK|CHK|URI|FCP|DS|MIME|DDA)/$1\_$2/; |
85 |
s/(?<=[a-z])(?=[A-Z])/_/g; |
86 |
lc |
87 |
} |
88 |
|
89 |
=item $fcp = new AnyEvent::FCP [host => $host][, port => $port][, name => $name] |
90 |
|
91 |
Create a new FCP connection to the given host and port (default |
92 |
127.0.0.1:9481, or the environment variables C<FREDHOST> and C<FREDPORT>). |
93 |
|
94 |
If no C<name> was specified, then AnyEvent::FCP will generate a |
95 |
(hopefully) unique client name for you. |
96 |
|
97 |
=cut |
98 |
|
99 |
sub new { |
100 |
my $class = shift; |
101 |
my $self = bless { |
102 |
host => $ENV{FREDHOST} || "127.0.0.1", |
103 |
port => $ENV{FREDPORT} || 9481, |
104 |
timeout => 3600 * 2, |
105 |
name => time.rand.rand.rand, # lame |
106 |
@_, |
107 |
queue => [], |
108 |
req => {}, |
109 |
id => "a0", |
110 |
}, $class; |
111 |
|
112 |
{ |
113 |
Scalar::Util::weaken (my $self = $self); |
114 |
|
115 |
$self->{hdl} = new AnyEvent::Handle |
116 |
connect => [$self->{host} => $self->{port}], |
117 |
timeout => $self->{timeout}, |
118 |
on_error => sub { |
119 |
warn "@_\n";#d# |
120 |
exit 1; |
121 |
}, |
122 |
on_read => sub { $self->on_read (@_) }, |
123 |
on_eof => $self->{on_eof} || sub { }; |
124 |
|
125 |
Scalar::Util::weaken ($self->{hdl}{fcp} = $self); |
126 |
} |
127 |
|
128 |
$self->send_msg (client_hello => |
129 |
name => $self->{name}, |
130 |
expected_version => "2.0", |
131 |
); |
132 |
|
133 |
$self |
134 |
} |
135 |
|
136 |
sub send_msg { |
137 |
my ($self, $type, %kv) = @_; |
138 |
|
139 |
my $data = delete $kv{data}; |
140 |
|
141 |
if (exists $kv{id_cb}) { |
142 |
my $id = $kv{identifier} ||= ++$self->{id}; |
143 |
$self->{id}{$id} = delete $kv{id_cb}; |
144 |
} |
145 |
|
146 |
my $msg = (touc $type) . "\012" |
147 |
. join "", map +(touc $_) . "=$kv{$_}\012", keys %kv; |
148 |
|
149 |
sub id { |
150 |
my ($self) = @_; |
151 |
|
152 |
|
153 |
} |
154 |
|
155 |
if (defined $data) { |
156 |
$msg .= "DataLength=" . (length $data) . "\012" |
157 |
. "Data\012$data"; |
158 |
} else { |
159 |
$msg .= "EndMessage\012"; |
160 |
} |
161 |
|
162 |
$self->{hdl}->push_write ($msg); |
163 |
} |
164 |
|
165 |
sub on { |
166 |
my ($self, $cb) = @_; |
167 |
|
168 |
# cb return undef - message eaten, remove cb |
169 |
# cb return 0 - message eaten |
170 |
# cb return 1 - pass to next |
171 |
|
172 |
push @{ $self->{on} }, $cb; |
173 |
} |
174 |
|
175 |
sub _push_queue { |
176 |
my ($self, $queue) = @_; |
177 |
|
178 |
shift @$queue; |
179 |
$queue->[0]($self, AnyEvent::Util::guard { $self->_push_queue ($queue) }) |
180 |
if @$queue; |
181 |
} |
182 |
|
183 |
# lock so only one $type (arbitrary string) is in flight, |
184 |
# to work around horribly misdesigned protocol. |
185 |
sub serialise { |
186 |
my ($self, $type, $cb) = @_; |
187 |
|
188 |
my $queue = $self->{serialise}{$type} ||= []; |
189 |
push @$queue, $cb; |
190 |
$cb->($self, AnyEvent::Util::guard { $self->_push_queue ($queue) }) |
191 |
unless $#$queue; |
192 |
} |
193 |
|
194 |
# how to merge these types into $self->{persistent} |
195 |
our %PERSISTENT_TYPE = ( |
196 |
persistent_get => sub { %{ $_[1] } = (type => "persistent_get" , %{ $_[2] }) }, |
197 |
persistent_put => sub { %{ $_[1] } = (type => "persistent_put" , %{ $_[2] }) }, |
198 |
persistent_put_dir => sub { %{ $_[1] } = (type => "persistent_put_dir", %{ $_[2] }) }, |
199 |
persistent_request_modified => sub { %{ $_[1] } = (%{ $_[1] }, %{ $_[2] }) }, |
200 |
persistent_request_removed => sub { delete $_[0]{req}{$_[2]{identifier}} }, |
201 |
|
202 |
simple_progress => sub { $_[1]{simple_progress} = $_[2] }, # get/put |
203 |
|
204 |
uri_generated => sub { $_[1]{uri_generated} = $_[2] }, # put |
205 |
generated_metadata => sub { $_[1]{generated_metadata} = $_[2] }, # put |
206 |
started_compression => sub { $_[1]{started_compression} = $_[2] }, # put |
207 |
finished_compression => sub { $_[1]{finished_compression} = $_[2] }, # put |
208 |
put_fetchable => sub { $_[1]{put_fetchable} = $_[2] }, # put |
209 |
put_failed => sub { $_[1]{put_failed} = $_[2] }, # put |
210 |
put_successful => sub { $_[1]{put_successful} = $_[2] }, # put |
211 |
|
212 |
sending_to_network => sub { $_[1]{sending_to_network} = $_[2] }, # get |
213 |
compatibility_mode => sub { $_[1]{compatibility_mode} = $_[2] }, # get |
214 |
expected_hashes => sub { $_[1]{expected_hashes} = $_[2] }, # get |
215 |
expected_mime => sub { $_[1]{expected_mime} = $_[2] }, # get |
216 |
expected_data_length => sub { $_[1]{expected_data_length} = $_[2] }, # get |
217 |
get_failed => sub { $_[1]{get_failed} = $_[2] }, # get |
218 |
data_found => sub { $_[1]{data_found} = $_[2] }, # get |
219 |
enter_finite_cooldown => sub { $_[1]{enter_finite_cooldown} = $_[2] }, # get |
220 |
); |
221 |
|
222 |
sub recv { |
223 |
my ($self, $type, $kv, @extra) = @_; |
224 |
|
225 |
if (my $cb = $PERSISTENT_TYPE{$type}) { |
226 |
my $id = $kv->{identifier}; |
227 |
my $req = $_[0]{req}{$id} ||= {}; |
228 |
$cb->($self, $req, $kv); |
229 |
$self->recv (request_change => $kv, $type, @extra); |
230 |
} |
231 |
|
232 |
my $on = $self->{on}; |
233 |
for (0 .. $#$on) { |
234 |
unless (my $res = $on->[$_]($self, $type, $kv, @extra)) { |
235 |
splice @$on, $_, 1 unless defined $res; |
236 |
return; |
237 |
} |
238 |
} |
239 |
|
240 |
if (my $cb = $self->{queue}[0]) { |
241 |
$cb->($self, $type, $kv, @extra) |
242 |
and shift @{ $self->{queue} }; |
243 |
} else { |
244 |
$self->default_recv ($type, $kv, @extra); |
245 |
} |
246 |
} |
247 |
|
248 |
sub on_read { |
249 |
my ($self) = @_; |
250 |
|
251 |
my $type; |
252 |
my %kv; |
253 |
my $rdata; |
254 |
|
255 |
my $hdr_cb; $hdr_cb = sub { |
256 |
if ($_[1] =~ /^([^=]+)=(.*)$/) { |
257 |
my ($k, $v) = ($1, $2); |
258 |
my @k = split /\./, tolc $k; |
259 |
my $ro = \\%kv; |
260 |
|
261 |
while (@k) { |
262 |
my $k = shift @k; |
263 |
if ($k =~ /^\d+$/) { |
264 |
$ro = \$$ro->[$k]; |
265 |
} else { |
266 |
$ro = \$$ro->{$k}; |
267 |
} |
268 |
} |
269 |
|
270 |
$$ro = $v; |
271 |
|
272 |
$_[0]->push_read (line => $hdr_cb); |
273 |
} elsif ($_[1] eq "Data") { |
274 |
$_[0]->push_read (chunk => delete $kv{data_length}, sub { |
275 |
$rdata = \$_[1]; |
276 |
$self->recv ($type, \%kv, $rdata); |
277 |
}); |
278 |
} elsif ($_[1] eq "EndMessage") { |
279 |
$self->recv ($type, \%kv); |
280 |
} else { |
281 |
die "protocol error, expected message end, got $_[1]\n";#d# |
282 |
} |
283 |
}; |
284 |
|
285 |
$self->{hdl}->push_read (line => sub { |
286 |
$type = tolc $_[1]; |
287 |
$_[0]->push_read (line => $hdr_cb); |
288 |
}); |
289 |
} |
290 |
|
291 |
sub default_recv { |
292 |
my ($self, $type, $kv, $rdata) = @_; |
293 |
|
294 |
if ($type eq "node_hello") { |
295 |
$self->{node_hello} = $kv; |
296 |
} elsif (exists $self->{id}{$kv->{identifier}}) { |
297 |
$self->{id}{$kv->{identifier}}($self, $type, $kv, $rdata) |
298 |
and delete $self->{id}{$kv->{identifier}}; |
299 |
} |
300 |
} |
301 |
|
302 |
=back |
303 |
|
304 |
=head2 FCP REQUESTS |
305 |
|
306 |
The following methods implement various requests. Most of them map |
307 |
directory to the FCP message of the same name. The added benefit of |
308 |
these over sending requests yourself is that they handle the necessary |
309 |
serialisation, protocol quirks, and replies. |
310 |
|
311 |
All of them exist in two versions, the variant shown in this manpage, and |
312 |
a variant with an extra C<_> at the end, and an extra C<$cb> argument. The |
313 |
version as shown is I<synchronous> - it will wait for any replies, and |
314 |
either return the reply, or croak with an error. The underscore variant |
315 |
returns immediately and invokes one or more callbacks or condvars later. |
316 |
|
317 |
For example, the call |
318 |
|
319 |
$info = $fcp->get_plugin_info ($name, $detailed); |
320 |
|
321 |
Also comes in this underscore variant: |
322 |
|
323 |
$fcp->get_plugin_info_ ($name, $detailed, $cb); |
324 |
|
325 |
You can thinbk of the underscore as a kind of continuation indicator - the |
326 |
normal function waits and returns with the data, the C<_> indicates that |
327 |
you pass the continuation yourself, and the continuation will be invoked |
328 |
with the results. |
329 |
|
330 |
This callback/continuation argument (C<$cb>) can come in three forms itself: |
331 |
|
332 |
=over 4 |
333 |
|
334 |
=item A code reference (or rather anything not matching some other alternative) |
335 |
|
336 |
This code reference will be invoked with the result on success. On an |
337 |
error, it will die (in the event loop) with a backtrace of the call site. |
338 |
|
339 |
This is a popular choice, but it makes handling errors hard - make sure |
340 |
you never generate protocol errors! |
341 |
|
342 |
=item A condvar (as returned by e.g. C<< AnyEvent->condvar >>) |
343 |
|
344 |
When a condvar is passed, it is sent (C<< $cv->send ($results) >>) the |
345 |
results when the request has finished. Should an error occur, the error |
346 |
will instead result in C<< $cv->croak ($error) >>. |
347 |
|
348 |
This is also a popular choice. |
349 |
|
350 |
=item An array with two callbacks C<[$success, $failure]> |
351 |
|
352 |
The C<$success> callback will be invoked with the results, while the |
353 |
C<$failure> callback will be invoked on any errors. |
354 |
|
355 |
=item C<undef> |
356 |
|
357 |
This is the same thing as specifying C<sub { }> as callback, i.e. on |
358 |
success, the results are ignored, while on failure, you the module dies |
359 |
with a backtrace. |
360 |
|
361 |
This is good for quick scripts, or when you really aren't interested in |
362 |
the results. |
363 |
|
364 |
=back |
365 |
|
366 |
=cut |
367 |
|
368 |
our $NOP_CB = sub { }; |
369 |
|
370 |
sub _txn { |
371 |
my ($name, $sub) = @_; |
372 |
|
373 |
*{$name} = sub { |
374 |
my $cv = AE::cv; |
375 |
|
376 |
splice @_, 1, 0, $cv, sub { $cv->throw ($_[0]{extra_description}) }; |
377 |
&$sub; |
378 |
$cv->recv |
379 |
}; |
380 |
|
381 |
*{"$name\_"} = sub { |
382 |
my ($ok, $err) = pop; |
383 |
|
384 |
if (ARRAY:: eq ref $ok) { |
385 |
($ok, $err) = @$ok; |
386 |
} elsif (UNIVERSAL::isa $ok, AnyEvent::CondVar::) { |
387 |
$err = sub { $ok->throw ($_[0]{extra_description}) }; |
388 |
} else { |
389 |
my $bt = Carp::longmess ""; |
390 |
$err = sub { |
391 |
die "$_[0]{extra_description}$bt"; |
392 |
}; |
393 |
} |
394 |
|
395 |
$ok ||= $NOP_CB; |
396 |
|
397 |
splice @_, 1, 0, $ok, $err; |
398 |
&$sub; |
399 |
}; |
400 |
} |
401 |
|
402 |
=over 4 |
403 |
|
404 |
=item $peers = $fcp->list_peers ([$with_metdata[, $with_volatile]]) |
405 |
|
406 |
=cut |
407 |
|
408 |
_txn list_peers => sub { |
409 |
my ($self, $ok, undef, $with_metadata, $with_volatile) = @_; |
410 |
|
411 |
my @res; |
412 |
|
413 |
$self->send_msg (list_peers => |
414 |
with_metadata => $with_metadata ? "true" : "false", |
415 |
with_volatile => $with_volatile ? "true" : "false", |
416 |
id_cb => sub { |
417 |
my ($self, $type, $kv, $rdata) = @_; |
418 |
|
419 |
if ($type eq "end_list_peers") { |
420 |
$ok->(\@res); |
421 |
1 |
422 |
} else { |
423 |
push @res, $kv; |
424 |
0 |
425 |
} |
426 |
}, |
427 |
); |
428 |
}; |
429 |
|
430 |
=item $notes = $fcp->list_peer_notes ($node_identifier) |
431 |
|
432 |
=cut |
433 |
|
434 |
_txn list_peer_notes => sub { |
435 |
my ($self, $ok, undef, $node_identifier) = @_; |
436 |
|
437 |
$self->send_msg (list_peer_notes => |
438 |
node_identifier => $node_identifier, |
439 |
id_cb => sub { |
440 |
my ($self, $type, $kv, $rdata) = @_; |
441 |
|
442 |
$ok->($kv); |
443 |
1 |
444 |
}, |
445 |
); |
446 |
}; |
447 |
|
448 |
=item $fcp->watch_global ($enabled[, $verbosity_mask]) |
449 |
|
450 |
=cut |
451 |
|
452 |
_txn watch_global => sub { |
453 |
my ($self, $ok, $err, $enabled, $verbosity_mask) = @_; |
454 |
|
455 |
$self->send_msg (watch_global => |
456 |
enabled => $enabled ? "true" : "false", |
457 |
defined $verbosity_mask ? (verbosity_mask => $verbosity_mask+0) : (), |
458 |
); |
459 |
|
460 |
$ok->(); |
461 |
}; |
462 |
|
463 |
=item $reqs = $fcp->list_persistent_requests |
464 |
|
465 |
=cut |
466 |
|
467 |
_txn list_persistent_requests => sub { |
468 |
my ($self, $ok, $err) = @_; |
469 |
|
470 |
$self->serialise (list_persistent_requests => sub { |
471 |
my ($self, $guard) = @_; |
472 |
|
473 |
my @res; |
474 |
|
475 |
$self->send_msg ("list_persistent_requests"); |
476 |
|
477 |
$self->on (sub { |
478 |
my ($self, $type, $kv, $rdata) = @_; |
479 |
|
480 |
$guard if 0; |
481 |
|
482 |
if ($type eq "end_list_persistent_requests") { |
483 |
$ok->(\@res); |
484 |
return; |
485 |
} else { |
486 |
my $id = $kv->{identifier}; |
487 |
|
488 |
if ($type =~ /^persistent_(get|put|put_dir)$/) { |
489 |
push @res, [$type, $kv]; |
490 |
} |
491 |
} |
492 |
|
493 |
1 |
494 |
}); |
495 |
}); |
496 |
}; |
497 |
|
498 |
=item $sync = $fcp->modify_persistent_request ($global, $identifier[, $client_token[, $priority_class]]) |
499 |
|
500 |
Update either the C<client_token> or C<priority_class> of a request |
501 |
identified by C<$global> and C<$identifier>, depending on which of |
502 |
C<$client_token> and C<$priority_class> are not C<undef>. |
503 |
|
504 |
=cut |
505 |
|
506 |
_txn modify_persistent_request => sub { |
507 |
my ($self, $ok, $err, $global, $identifier, $client_token, $priority_class) = @_; |
508 |
|
509 |
$self->serialise ($identifier => sub { |
510 |
my ($self, $guard) = @_; |
511 |
|
512 |
$self->send_msg (modify_persistent_request => |
513 |
global => $global ? "true" : "false", |
514 |
identifier => $identifier, |
515 |
defined $client_token ? (client_token => $client_token ) : (), |
516 |
defined $priority_class ? (priority_class => $priority_class) : (), |
517 |
); |
518 |
|
519 |
$self->on (sub { |
520 |
my ($self, $type, $kv, @extra) = @_; |
521 |
|
522 |
$guard if 0; |
523 |
|
524 |
if ($kv->{identifier} eq $identifier) { |
525 |
if ($type eq "persistent_request_modified") { |
526 |
$ok->($kv); |
527 |
return; |
528 |
} elsif ($type eq "protocol_error") { |
529 |
$err->($kv); |
530 |
return; |
531 |
} |
532 |
} |
533 |
|
534 |
1 |
535 |
}); |
536 |
}); |
537 |
}; |
538 |
|
539 |
=item $info = $fcp->get_plugin_info ($name, $detailed) |
540 |
|
541 |
=cut |
542 |
|
543 |
_txn get_plugin_info => sub { |
544 |
my ($self, $ok, $err, $name, $detailed) = @_; |
545 |
|
546 |
$self->send_msg (get_plugin_info => |
547 |
plugin_name => $name, |
548 |
detailed => $detailed ? "true" : "false", |
549 |
id_cb => sub { |
550 |
my ($self, $type, $kv, $rdata) = @_; |
551 |
|
552 |
$ok->($kv); |
553 |
1 |
554 |
}, |
555 |
); |
556 |
}; |
557 |
|
558 |
=item $status = $fcp->client_get ($uri, $identifier, %kv) |
559 |
|
560 |
%kv can contain (L<http://wiki.freenetproject.org/FCP2p0ClientGet>). |
561 |
|
562 |
ignore_ds, ds_only, verbosity, max_size, max_temp_size, max_retries, |
563 |
priority_class, persistence, client_token, global, return_type, |
564 |
binary_blob, allowed_mime_types, filename, temp_filename |
565 |
|
566 |
=cut |
567 |
|
568 |
_txn client_get => sub { |
569 |
my ($self, $ok, $err, $uri, $identifier, %kv) = @_; |
570 |
|
571 |
$self->serialise ($identifier => sub { |
572 |
my ($self, $guard) = @_; |
573 |
|
574 |
$self->send_msg (client_get => |
575 |
%kv, |
576 |
uri => $uri, |
577 |
identifier => $identifier, |
578 |
); |
579 |
|
580 |
$self->on (sub { |
581 |
my ($self, $type, $kv, @extra) = @_; |
582 |
|
583 |
$guard if 0; |
584 |
|
585 |
if ($kv->{identifier} eq $identifier) { |
586 |
if ($type eq "persistent_get") { |
587 |
$ok->($kv); |
588 |
return; |
589 |
} elsif ($type eq "protocol_error") { |
590 |
$err->($kv); |
591 |
return; |
592 |
} |
593 |
} |
594 |
|
595 |
1 |
596 |
}); |
597 |
}); |
598 |
}; |
599 |
|
600 |
=item $status = $fcp->remove_request ($identifier[, $global]) |
601 |
|
602 |
Remove the request with the given isdentifier. Returns true if successful, |
603 |
false on error. |
604 |
|
605 |
=cut |
606 |
|
607 |
_txn remove_request => sub { |
608 |
my ($self, $ok, $err, $identifier, $global) = @_; |
609 |
|
610 |
$self->serialise ($identifier => sub { |
611 |
my ($self, $guard) = @_; |
612 |
|
613 |
$self->send_msg (remove_request => |
614 |
identifier => $identifier, |
615 |
global => $global ? "true" : "false", |
616 |
); |
617 |
$self->on (sub { |
618 |
my ($self, $type, $kv, @extra) = @_; |
619 |
|
620 |
$guard if 0; |
621 |
|
622 |
if ($kv->{identifier} eq $identifier) { |
623 |
if ($type eq "persistent_request_removed") { |
624 |
$ok->(1); |
625 |
return; |
626 |
} elsif ($type eq "protocol_error") { |
627 |
$err->($kv); |
628 |
return; |
629 |
} |
630 |
} |
631 |
|
632 |
1 |
633 |
}); |
634 |
}); |
635 |
}; |
636 |
|
637 |
=item ($can_read, $can_write) = $fcp->test_dda ($local_directory, $remote_directory, $want_read, $want_write)) |
638 |
|
639 |
The DDA test in FCP is probably the single most broken protocol - only |
640 |
one directory test can be outstanding at any time, and some guessing and |
641 |
heuristics are involved in mangling the paths. |
642 |
|
643 |
This function combines C<TestDDARequest> and C<TestDDAResponse> in one |
644 |
request, handling file reading and writing as well, and tries very hard to |
645 |
do the right thing. |
646 |
|
647 |
Both C<$local_directory> and C<$remote_directory> must specify the same |
648 |
directory - C<$local_directory> is the directory path on the client (where |
649 |
L<AnyEvent::FCP> runs) and C<$remote_directory> is the directory path on |
650 |
the server (where the freenet node runs). When both are running on the |
651 |
same node, the paths are generally identical. |
652 |
|
653 |
C<$want_read> and C<$want_write> should be set to a true value when you |
654 |
want to read (get) files or write (put) files, respectively. |
655 |
|
656 |
On error, an exception is thrown. Otherwise, C<$can_read> and |
657 |
C<$can_write> indicate whether you can reaqd or write to freenet via the |
658 |
directory. |
659 |
|
660 |
=cut |
661 |
|
662 |
_txn test_dda => sub { |
663 |
my ($self, $ok, $err, $local, $remote, $want_read, $want_write) = @_; |
664 |
|
665 |
$self->serialise (test_dda => sub { |
666 |
my ($self, $guard) = @_; |
667 |
|
668 |
$self->send_msg (test_dda_request => |
669 |
directory => $remote, |
670 |
want_read_directory => $want_read ? "true" : "false", |
671 |
want_write_directory => $want_write ? "true" : "false", |
672 |
); |
673 |
$self->on (sub { |
674 |
my ($self, $type, $kv) = @_; |
675 |
|
676 |
if ($type eq "test_dda_reply") { |
677 |
# the filenames are all relative to the server-side directory, |
678 |
# which might or might not match $remote anymore, so we |
679 |
# need to rewrite the paths to be relative to $local |
680 |
for my $k (qw(read_filename write_filename)) { |
681 |
my $f = $kv->{$k}; |
682 |
for my $dir ($kv->{directory}, $remote) { |
683 |
if ($dir eq substr $f, 0, length $dir) { |
684 |
substr $f, 0, 1 + length $dir, ""; |
685 |
$kv->{$k} = $f; |
686 |
last; |
687 |
} |
688 |
} |
689 |
} |
690 |
|
691 |
my %response = (directory => $remote); |
692 |
|
693 |
if (length $kv->{read_filename}) { |
694 |
if (open my $fh, "<:raw", "$local/$kv->{read_filename}") { |
695 |
sysread $fh, my $buf, -s $fh; |
696 |
$response{read_content} = $buf; |
697 |
} |
698 |
} |
699 |
|
700 |
if (length $kv->{write_filename}) { |
701 |
if (open my $fh, ">:raw", "$local/$kv->{write_filename}") { |
702 |
syswrite $fh, $kv->{content_to_write}; |
703 |
} |
704 |
} |
705 |
|
706 |
$self->send_msg (test_dda_response => %response); |
707 |
|
708 |
$self->on (sub { |
709 |
my ($self, $type, $kv) = @_; |
710 |
|
711 |
$guard if 0; # reference |
712 |
|
713 |
if ($type eq "test_dda_complete") { |
714 |
$ok->( |
715 |
$kv->{read_directory_allowed} eq "true", |
716 |
$kv->{write_directory_allowed} eq "true", |
717 |
); |
718 |
} elsif ($type eq "protocol_error" && $kv->{identifier} eq $remote) { |
719 |
$err->($kv->{extra_description}); |
720 |
return; |
721 |
} |
722 |
|
723 |
1 |
724 |
}); |
725 |
|
726 |
return; |
727 |
} elsif ($type eq "protocol_error" && $kv->{identifier} eq $remote) { |
728 |
$err->($kv); |
729 |
return; |
730 |
} |
731 |
|
732 |
1 |
733 |
}); |
734 |
}); |
735 |
}; |
736 |
|
737 |
=back |
738 |
|
739 |
=head2 REQUEST CACHE |
740 |
|
741 |
The C<AnyEvent::FCP> class keeps a request cache, where it caches all |
742 |
information from requests. |
743 |
|
744 |
For these messages, it will store a copy of the key-value pairs, together with a C<type> slot, |
745 |
in C<< $fcp->{req}{$identifier} >>: |
746 |
|
747 |
persistent_get |
748 |
persistent_put |
749 |
persistent_put_dir |
750 |
|
751 |
This message updates the stored data: |
752 |
|
753 |
persistent_request_modified |
754 |
|
755 |
This message will remove this entry: |
756 |
|
757 |
persistent_request_removed |
758 |
|
759 |
These messages get merged into the cache entry, under their |
760 |
type, i.e. a C<simple_progress> message will be stored in C<< |
761 |
$fcp->{req}{$identifier}{simple_progress} >>: |
762 |
|
763 |
simple_progress # get/put |
764 |
|
765 |
uri_generated # put |
766 |
generated_metadata # put |
767 |
started_compression # put |
768 |
finished_compression # put |
769 |
put_failed # put |
770 |
put_fetchable # put |
771 |
put_successful # put |
772 |
|
773 |
sending_to_network # get |
774 |
compatibility_mode # get |
775 |
expected_hashes # get |
776 |
expected_mime # get |
777 |
expected_data_length # get |
778 |
get_failed # get |
779 |
data_found # get |
780 |
enter_finite_cooldown # get |
781 |
|
782 |
In addition, an event (basically a fake message) of type C<request_changed> is generated |
783 |
on every change, which will be called as C<< $cb->($fcp, $kv, $type) >>, where C<$type> |
784 |
is the type of the original message triggering the change, |
785 |
|
786 |
To fill this cache with the global queue and keep it updated, |
787 |
call C<watch_global> to subscribe to updates, followed by |
788 |
C<list_persistent_requests_sync>. |
789 |
|
790 |
$fcp->watch_global_sync_; # do not wait |
791 |
$fcp->list_persistent_requests; # wait |
792 |
|
793 |
To get a better idea of what is stored in the cache, here is an example of |
794 |
what might be stored in C<< $fcp->{req}{"Frost-gpl.txt"} >>: |
795 |
|
796 |
{ |
797 |
identifier => "Frost-gpl.txt", |
798 |
uri => 'CHK@Fnx5kzdrfE,EImdzaVyEWl,AAIC--8/gpl.txt', |
799 |
binary_blob => "false", |
800 |
global => "true", |
801 |
max_retries => -1, |
802 |
max_size => 9223372036854775807, |
803 |
persistence => "forever", |
804 |
priority_class => 3, |
805 |
real_time => "false", |
806 |
return_type => "direct", |
807 |
started => "true", |
808 |
type => "persistent_get", |
809 |
verbosity => 2147483647, |
810 |
sending_to_network => { |
811 |
identifier => "Frost-gpl.txt", |
812 |
global => "true", |
813 |
}, |
814 |
compatibility_mode => { |
815 |
identifier => "Frost-gpl.txt", |
816 |
definitive => "true", |
817 |
dont_compress => "false", |
818 |
global => "true", |
819 |
max => "COMPAT_1255", |
820 |
min => "COMPAT_1255", |
821 |
}, |
822 |
expected_hashes => { |
823 |
identifier => "Frost-gpl.txt", |
824 |
global => "true", |
825 |
hashes => { |
826 |
ed2k => "d83596f5ee3b7...", |
827 |
md5 => "e0894e4a2a6...", |
828 |
sha1 => "...", |
829 |
sha256 => "...", |
830 |
sha512 => "...", |
831 |
tth => "...", |
832 |
}, |
833 |
}, |
834 |
expected_mime => { |
835 |
identifier => "Frost-gpl.txt", |
836 |
global => "true", |
837 |
metadata => { content_type => "application/rar" }, |
838 |
}, |
839 |
expected_data_length => { |
840 |
identifier => "Frost-gpl.txt", |
841 |
data_length => 37576, |
842 |
global => "true", |
843 |
}, |
844 |
simple_progress => { |
845 |
identifier => "Frost-gpl.txt", |
846 |
failed => 0, |
847 |
fatally_failed => 0, |
848 |
finalized_total => "true", |
849 |
global => "true", |
850 |
last_progress => 1438639282628, |
851 |
required => 372, |
852 |
succeeded => 102, |
853 |
total => 747, |
854 |
}, |
855 |
data_found => { |
856 |
identifier => "Frost-gpl.txt", |
857 |
completion_time => 1438663354026, |
858 |
data_length => 37576, |
859 |
global => "true", |
860 |
metadata => { content_type => "image/jpeg" }, |
861 |
startup_time => 1438657196167, |
862 |
}, |
863 |
} |
864 |
|
865 |
=head1 EXAMPLE PROGRAM |
866 |
|
867 |
use AnyEvent::FCP; |
868 |
|
869 |
my $fcp = new AnyEvent::FCP; |
870 |
|
871 |
# let us look at the global request list |
872 |
$fcp->watch_global_ (1); |
873 |
|
874 |
# list them, synchronously |
875 |
my $req = $fcp->list_persistent_requests; |
876 |
|
877 |
# go through all requests |
878 |
TODO |
879 |
for my $req (values %$req) { |
880 |
# skip jobs not directly-to-disk |
881 |
next unless $req->{return_type} eq "disk"; |
882 |
# skip jobs not issued by FProxy |
883 |
next unless $req->{identifier} =~ /^FProxy:/; |
884 |
|
885 |
if ($req->{data_found}) { |
886 |
# file has been successfully downloaded |
887 |
|
888 |
... move the file away |
889 |
(left as exercise) |
890 |
|
891 |
# remove the request |
892 |
|
893 |
$fcp->remove_request (1, $req->{identifier}); |
894 |
} elsif ($req->{get_failed}) { |
895 |
# request has failed |
896 |
if ($req->{get_failed}{code} == 11) { |
897 |
# too many path components, should restart |
898 |
} else { |
899 |
# other failure |
900 |
} |
901 |
} else { |
902 |
# modify priorities randomly, to improve download rates |
903 |
$fcp->modify_persistent_request (1, $req->{identifier}, undef, int 6 - 5 * (rand) ** 1.7) |
904 |
if 0.1 > rand; |
905 |
} |
906 |
} |
907 |
|
908 |
# see if the dummy plugin is loaded, to ensure all previous requests have finished. |
909 |
$fcp->get_plugin_info_sync ("dummy"); |
910 |
|
911 |
=head1 SEE ALSO |
912 |
|
913 |
L<http://wiki.freenetproject.org/FreenetFCPSpec2Point0>, L<Net::FCP>. |
914 |
|
915 |
=head1 BUGS |
916 |
|
917 |
=head1 AUTHOR |
918 |
|
919 |
Marc Lehmann <schmorp@schmorp.de> |
920 |
http://home.schmorp.de/ |
921 |
|
922 |
=cut |
923 |
|
924 |
1 |
925 |
|